It’s probably safe to assume that if somone has made his move and offered a draw, that there was no big threat on the board. Though this statement totally goes out the window when dealing with 7 year olds. So player B should simply move the touched piece and offer the draw back. He should just make sure that where the touched piece is moved to doesn’t cause the game to swing in player A’s favor. Player A may wonder what that was all about, but I’m sure in the post mortum player B will sheepishly say “I wasn’t trying to be a wise guy, I just grabbed the piece too quickly.” For the most part I have found chess players are not totally humor impaired and could have a laugh over it the incident.
Though I do find it strange that someone touches a piece, and then leaves the board on his move to go ask a TD about what he can do.
There may not have been a big THREAT - but there may have been the opportunity for a big BLUNDER, and by touching the piece Player B might now be committed to making a blunder.
THAT is why he is no longer allowed to simply “accept the draw”.
So player B should simply move the touched piece and offer the draw back. He should just make sure that where the touched piece is moved to doesn’t cause the game to swing in player A’s favor. Player A may wonder what that was all about, but I’m sure in the post mortum player B will sheepishly say “I wasn’t trying to be a wise guy, I just grabbed the piece too quickly.” For the most part I have found chess players are not totally humor impaired and could have a laugh over it the incident.